The BakePen blog

Notes from the test kitchen

Long-form, practical writing on the subjects the tools deal in: measuring honestly, converting properly, dough maths without tears, and diagnosing the bakes that go sideways. Every article is written for this site, tested against the same reference tables the converters use.

Measure & Convert

Weighing vs cups: what the scale actually changes

A cup of flour can vary by 25% depending on how it is filled; a gram cannot.

5 min read · Updated 11 Oct 2026

Oven & Kitchen

Oven temperatures explained: Fahrenheit, Celsius, Gas Mark and the fan

350 °F = 175–180 °C = Gas Mark 4: the centre of the baking world.

5 min read · Updated 8 Oct 2026

Recipes & Planning

How to scale a recipe up or down without breaking it

Ingredients scale by one factor, applied to every line without exception.

5 min read · Updated 5 Oct 2026

Oven & Kitchen

Cake pan sizes: capacities, swaps and how much batter each one holds

Pans are volumes: base area times depth decides what a batter experiences.

5 min read · Updated 2 Oct 2026

Ingredients

Yeast types compared: fresh, instant and active dry

Fresh : active dry : instant ≈ 3 : 1.2 : 1 by weight for the same lift.

6 min read · Updated 29 Sep 2026

Dough & Baking Science

Baker's percentages explained simply, with one loaf worked end to end

Flour is always 100%; every other ingredient is a share of the flour weight.

5 min read · Updated 26 Sep 2026

Dough & Baking Science

Dough hydration: what the percentage means and how to steer it

Hydration = total water ÷ total flour, starter halves included.

5 min read · Updated 22 Sep 2026

Baking Science

Why ingredient temperature matters more than the recipe admits

Room temperature means 20–22 °C, and butter at that point is plastic, able to trap air.

6 min read · Updated 19 Sep 2026

Troubleshooting

Common baking failures, and what actually caused them

Every failure is a physical event with a short list of causes — read it, don’t mourn it.

5 min read · Updated 15 Sep 2026

Ingredients

Flour types and protein: choosing the right bag for the bake

Protein percentage predicts a flour’s behaviour better than its name does.

6 min read · Updated 12 Sep 2026

Ingredients

Butter in baking: what it actually does, and how to measure it in any unit

A US stick is 113.4 g; a cup of butter is 227 g; a 250 g block is neither.

6 min read · Updated 9 Sep 2026

Ingredients

Sugar types: what granulated, caster, brown and icing each do differently

Crystal size controls creaming and dissolution — caster for cakes, granulated for sturdiness.

6 min read · Updated 6 Sep 2026

Measure & Convert

How to measure flour correctly: the spoon, level and weigh methods compared

Scooping can add 25% extra flour; spoon-and-level is the chart standard at 125 g a cup.

6 min read · Updated 3 Sep 2026

Dough & Baking Science

Egg sizes explained: what medium, large and extra-large really mean in a recipe

Size labels are weight bands, and UK larges outweigh US larges by about 20%.

5 min read · Updated 31 Aug 2026

Dough & Baking Science

Baking soda vs baking powder: the chemistry, and when a swap works

Soda is a base needing acid; powder is soda with its acid built in.

6 min read · Updated 28 Aug 2026

Dough & Baking Science

Sourdough starter feeding ratios, explained without the mystique

Ratios read starter : flour : water by weight — and they are timers, not grades.

6 min read · Updated 25 Aug 2026

Recipes & Planning

How to price home baking for sale: costs first, then the courage

Price in layers: ingredients by use, then time, then overheads and margin.

5 min read · Updated 22 Aug 2026

Kitchen Craft

Freezing bakes and doughs: a make-ahead guide that keeps quality

Freeze structure, not foam: crumbs, doughs and batters forgive ice; custards and meringues do not.

5 min read · Updated 19 Aug 2026

Baking Science

Baking at altitude: the adjustments that actually work

Thin air means more gas expansion, faster evaporation, cooler boiling — adjust for the fact, not the folklore.

6 min read · Updated 15 Aug 2026

Ingredients

Chocolate and cocoa: a baker’s working guide to bars, chips and powders

Percentage = share from the bean; mostly it is a sweetness-and-intensity dial.

6 min read · Updated 12 Aug 2026

Ingredients

Dairy substitutions in baking: milk, cream, yoghurt and buttermilk

Every dairy swap moves two dials: fat and acidity. Name both before swapping.

6 min read · Updated 9 Aug 2026

Ingredients

Gluten-free flour blends that actually work, and why single flours fail

Gluten did four jobs; blends replace it with a committee of flours, starches and a binder.

6 min read · Updated 6 Aug 2026

Oven & Kitchen

Lining pans properly: parchment, grease, flour and foil compared

Release is a system chosen per bake: foams grip, sugars weld, crumbs forgive.

5 min read · Updated 3 Aug 2026

Kitchen Craft

Cooling and storing bakes: racks, wrapping and the fridge question

Cooling finishes the bake: rest in the tin briefly, then a rack, then patience.

6 min read · Updated 31 Jul 2026

Kitchen Craft

Choosing a kitchen scale: accuracy, capacity and the features that matter

Accuracy and honesty beat fine resolution: test with a litre of water and a coin.

6 min read · Updated 28 Jul 2026

Oven & Kitchen

Oven hot spots and calibration: mapping your oven’s real temperatures

No dial tells the truth by default — map your oven with toast and a thermometer.

6 min read · Updated 25 Jul 2026

Baking Science

Testing doneness without gadgets: skewer, spring, colour and sound

Time is an estimate; tests are the verdict — aim to start testing, not to stop baking, at the timer.

6 min read · Updated 22 Jul 2026

Oven & Kitchen

Cake portions: how much cake a party, wedding or bake sale actually needs

Portions are standards, not guesses: dessert, party and wedding cuts differ by design.

5 min read · Updated 19 Jul 2026

Measure & Convert

Converting a whole recipe between US and metric: a complete workflow

Convert in order: flour first (own density), then sugars, fats, liquids, small lines, temperature.

6 min read · Updated 16 Jul 2026

Recipes & Planning

Planning a bake day: lists, timing, and never forgetting the eggs again

Build the list from recipes, combine quantities across bakes, then re-read the methods for hidden ingredients.

6 min read · Updated 13 Jul 2026